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Retired power lithium battery screening method and system based on temperature change clustering analysis

A technology of temperature change and cluster analysis, applied to secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as not considering battery thermal characteristics, and achieve the effect of reducing difficulty and improving efficiency

Active Publication Date: 2020-11-24
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a screening method for decommissioned power lithium batteries based on temperature change cluster analysis, which solves the technical problem that the battery thermal characteristics are not considered in the screening of decommissioned power lithium batteries

Method used

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  • Retired power lithium battery screening method and system based on temperature change clustering analysis
  • Retired power lithium battery screening method and system based on temperature change clustering analysis
  • Retired power lithium battery screening method and system based on temperature change clustering analysis

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Experimental program
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Embodiment 1

[0044] Such as figure 2 As shown, the numbers in the figure represent the corresponding steps. This embodiment provides specific steps for testing working conditions:

[0045] 1. Charge the battery to the allowable maximum voltage V with a constant current of 1C max ;

[0046] 2. Keep the battery terminal voltage at V max , continue to charge until the current is less than 0.02A, and the charge ends;

[0047] 3. Let the battery stand for 2 hours;

[0048] 4. Discharge the battery to the state of charge SOC = 50% at a current rate of 1 / 3C;

[0049] 5. Let the battery stand for 1 hour;

[0050] 6. Charge the battery with 1 / 4C current pulse for 20 seconds;

[0051] 7. Let the battery stand for 10 minutes;

[0052] 8. Discharge the battery at a current rate of 1 / 4C for 20 seconds;

[0053] 9. Let the battery stand for 10 minutes;

[0054] 10. Charge the battery with 1 / 2C current pulse for 20 seconds;

[0055] 11. Let the battery stand for 10 minutes;

[0056] 12. Disc...

Embodiment 2

[0066] This embodiment provides a method for screening decommissioned power lithium batteries based on cluster analysis of temperature changes, including the following steps:

[0067] 1) The first level of screening for retired power lithium batteries: battery capacity screening. Before charging the battery with constant current and constant voltage, discharge the battery to the cut-off voltage, and calculate the capacity of the battery by the following formula

[0068]

[0069] In the formula, Q i is the calculated capacity of the i-th battery, t 1 is the start time of constant current and constant voltage charging process, t 2 is the cut-off time of the constant current and constant voltage charging process, and i(t) is the current of the charging process.

[0070] According to the calculated overall distribution of the capacity of all decommissioned power lithium batteries, select [Q min ,Q max ] in the range N Q A decommissioned power lithium battery, of which, N ...

Embodiment 3

[0100] This embodiment provides a decommissioned power lithium battery screening system based on temperature change cluster analysis, such as image 3 shown, including

[0101] The data acquisition module is used to collect the current and voltage of the decommissioned power lithium battery to be screened;

[0102] The infrared imaging module is used to obtain the temperature change of the battery;

[0103] The calculation module is used to calculate the battery capacity, battery DC internal resistance and temperature change characteristics of the decommissioned power lithium battery to be screened;

[0104] The screening module is used to screen out the required decommissioned power lithium batteries that meet the requirements.

[0105] Specifically, a specific test condition is set in the power unit in advance, and the charge and discharge test is performed on the decommissioned power lithium battery. On this basis, the current and voltage measurement data of the decommis...

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Abstract

The invention discloses a retired power lithium battery screening method based on temperature change clustering analysis. The retired power lithium battery screening method comprises the steps of designing a test working condition for a retired power lithium battery screening process; extracting the battery capacity from the test process, and performing first-level screening; extracting the internal resistance of the battery, and performing second-level screening; and on the basis, recording the temperature change in the test process by using infrared thermal imaging, calculating the variationcoefficient and the information entropy respectively according to the temperature change characteristics, performing third-level screening through clustering operation analysis and obtaining retiredbattery monomers with good electrical and thermal characteristic consistency. The invention further discloses a retired power lithium battery screening system based on temperature change clustering analysis. The retired power lithium battery screening system comprises a data acquisition module, an infrared imaging module, a calculation module and a screening module. According to the retired powerlithium battery screening method and system, on the basis of ensuring the consistency of the electrical characteristics of the retired power lithium batteries, the retired battery monomers with relatively uniform thermal characteristics are selected to form the battery pack, so that the efficiency of utilizing the battery pack in an echelon mode is improved.

Description

technical field [0001] The invention belongs to the field of cascade utilization of decommissioned power lithium batteries, and in particular relates to a screening method for decommissioned power lithium batteries based on temperature change cluster analysis. Background technique [0002] In recent years, the number of new energy vehicles in China has increased rapidly, and my country has become the main market for new energy vehicles in the world. As the most important energy storage component of new energy vehicles, power lithium batteries inevitably age continuously during use. Excessive use of lithium batteries in new energy vehicles will also create potential safety risks. Therefore, power batteries with a capacity retention rate lower than a specific value should be retired from new energy vehicles in a timely manner to ensure the safety of vehicles. Therefore, a large number of new energy vehicles also means that there will be a large number of retired power lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344B07C5/34H01M10/42
CPCB07C5/344B07C5/34H01M10/4207Y02E60/10
Inventor 彭纪昌孟锦豪刘海涛蔡磊
Owner NANJING INST OF TECH